The fire broke out at a triplex in the 4200 block of Washington Avenue W., said Seattle Fire. Video from the scene showed smoke and flames coming from one of the large historic homes at Fort Lawton, a U.S. Army post that was built in 1900 to protect Seattle and the Puget Sound from a naval attack.

The best preserved group of early Fort Lawton buildings was declared a landmark district in 1988. Some of those builders were converted to luxury homes and put on the market last year. According to the development company's website, the historic homes along Officer's Row, where the fire took place, range between 4,027 to 6,600 square feet.

Seattle Fire said one worker was transported to a hospital for minor burns.

Crews planed to stay on scene through the night to watch for flair ups. On Thursday, officials will being to investigate the cause and cost of the damage.